664457077 has 4 divisors (see below), whose sum is σ = 687369420. Its totient is φ = 641544736.

The previous prime is 664457047. The next prime is 664457099. The reversal of 664457077 is 770754466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 143065521 + 521391556 = 11961^2 + 22834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664457077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664457047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11456128 + ... + 11456185.

It is an arithmetic number, because the mean of its divisors is an integer number (171842355).

Almost surely, 2^664457077 is an apocalyptic number.

It is an amenable number.

664457077 is a deficient number, since it is larger than the sum of its proper divisors (22912343).

664457077 is a wasteful number, since it uses less digits than its factorization.

664457077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22912342.

The product of its (nonzero) digits is 987840, while the sum is 46.

The square root of 664457077 is about 25777.0649415328. The cubic root of 664457077 is about 872.6142693171.

The spelling of 664457077 in words is "six hundred sixty-four million, four hundred fifty-seven thousand, seventy-seven".